A number of internet service providers appear to be down today across the country, from California in the west to New York in the east. According to DownDetector.com, most recent reports for Comcast are coming from Mountain View, Denver, New York, Portland, Chicago, Seattle, Houston, San Francisco, and Minneapolis.

While it's not clear what caused the widespread outage, Comcast has confirmed it via Twitter:

Some customers are having issues with their XFINITY Internet service. We apologize & appreciate your patience while we work to fix.

Comcast is the largest provider of cable broadband internet in the United States, serving about 110 million customers, according to PracticalEcommerce. Obviously, this means that the company is in a position where such an outage will affect the most people, so we can only hope that this gets resolved quickly.

But it's not just Comcast, as we can see from the map below that Verizon is also having issues.

These reports are originating from similar places, including New York, Mountain View, Washington, Rochester, and more.

Indeed, it would seem that many ISPs are experiencing similar issues, and you can check out DownDetector.com to find out how yours is doing in your area.

We'll certainly learn more about what caused this as time goes on, and it should be interesting to find out. Make sure to stay tuned to Neowin, as we'll keep you updated.

Is your broadband internet down? Let us know in the comments!

Update: According to a report from Wired, the whole incident was caused by a route leak. This is caused when Autonomous Systems "issue incorrect information about the IP addresses on their network, which causes inefficient routing and failures for both the originating ISP and other ISPs trying to route traffic through."